crt: Need a position-independent CRT for PIE
- Implement the greatest possible part of the crt1 in C
- Implement SPARC versions of the ASM sections of crt1
- Build crt1 position-independently, minor ASM updates to be position
  independent
- Implement crt1 with the hook expected by modern GCC to support
  profiling, make gcrt1 a symlink for source compatibility (older GCC
  initializes profiling at firsnt use of _mcount if necessary, so
  doesn't need the gcrt)
- Split the CRT out of developer/library/lint into a separate c-runtime package

*** 263,273 ****
  
  pics/%.o: $(LIBCBASE)/../port/sys/%.c
          $(COMPILE.c) -o $@ $<
          $(POST_PROCESS_O)
  
! pics/%.o: $(LIBCBASE)/../../common/common/%.c
          $(COMPILE.c) -o $@ $<
          $(POST_PROCESS_O)
  
  pics/%.o: $(LIBCBASE)/$(CRTSRCS)/%.s
          $(BUILD.s)
--- 263,273 ----
  
  pics/%.o: $(LIBCBASE)/../port/sys/%.c
          $(COMPILE.c) -o $@ $<
          $(POST_PROCESS_O)
  
! pics/%.o: $(LIBCBASE)/../../crt/common/%.c
          $(COMPILE.c) -o $@ $<
          $(POST_PROCESS_O)
  
  pics/%.o: $(LIBCBASE)/$(CRTSRCS)/%.s
          $(BUILD.s)